<?php
namespace common\helpers;

class Blooms
{
    public $seeds = [1, 2, 3];
    public $key = 'bloom_filter';
    public $size = null;

    public function __construct()
    {
        $this->size = pow(2, 32);
    }

    public function addToBloomFilter($element)
    {
        foreach ($this->seeds as $seed) {
            $str = $element . $seed;
            $value = crc32($str);
            $int_value = $value % $this->size;
            $res = \Yii::$app->redis->setbit($this->key . $seed, $int_value, 1);
            if ($res) {
                return false;
            }
        }
        return true;
    }

    public function isInBloomFilter($element)
    {
        foreach ($this->seeds as $seed) {
            $str = $element . $seed;
            $value = crc32($str);
            $int_value = $value % $this->size;
            $res = \Yii::$app->redis->getbit($this->key. $seed, $int_value);
            if ($res == false) {
                return false;
            }
        }
        return true;
    }

}